Siphon for aerated liquids



Aug. 22, 1939. w. BREWER sumo: FOR AERATED LIQUIDS Filed July 3, 193? IDUE/7210! Mia/am Brews/ Patented Aug. 22, 1939 PATENT OFFICE,

, I 2,170,705 SIPHON FORAERATED LIQUIDS William Brewer, Upper Edmonton,London, England, assignor to Sparklets Limited, Westminster, England, aBritishcompany Application July 3, 1937, Serial No. 151,920 In GreatBritain May 14, 1937 1 Claim.

This invention relates to glass siphons for dispensing aerated liquidsof the type in which water or solutions of appropriate salts are chargedwith carbon dioxide by the introduction into the siphon of carbondioxide under pressure. It is usual to introduce the gas through a tubedipping into the liquid and extending nearly to the bottom of thesiphon. If the compressed gas be allowed to escape from the said diptube into the liquid too rapidly, there is a possibility that solidcarbon dioxide may be formed. In the case of the well-known Sparkletsiphon, in which the carbon dioxide is introduced into the liquid from asmall capsule containing the gas under pressure, the said capsule beingpierced by a hollow needle against which the mouth of the capsule isforced, there is only a remote possibility of solid carbon dioxide beingformed owing to careless manipulation as the result of which the gas isintroduced much too rapidly. In the unlikely event of solid carbondioxide being formed, however, this will be forced through the dip tubeonto the bottom of the glass siphon. By reason coming into contact withthe glass bottom of the siphon. This may be effected by providing abaffle in or on the dip tube, for example by attaching to the lower endof the dip tube a sleeve, for example of pure tin, having a number ofintegrally stepped projections, which projections hold in position adisc, for example of stainless steel, the extreme ends of theprojections being turned over the disc for this purpose. The distancebetween the lower end of the projections and the disc should be such asto provide anumber of openings of sufficient total area to allow freepassage of liquid when the siphon is operated.

When the carbon dioxide passes down the dip tube, it encounters thedisc, which acts as a baffle, and is forced to pass out through the saidopenings in a direction approximately at right angles to the dip tube.In this way any solid carbon dioxide formed is dispersed in thesurrounding liquid before it can come into contact with the glass baseor walls of the siphon.

The baflle may be constructed in other ways. For example the end of theglass tube may be constructed so as to check any solid carbon dioxidewithout the use of any metal at all. Thus the end of the dip tube may beclosed and widened somewhat, a number of longitudinal slots beingprovided around the sides thereof adjacent the lower end.

By providing means according to this invention, any danger of weakeningthe siphon in the unlikely event of the formation of solid carbondioxide is efiectively avoided.

The invention will be further described with reference to theaccompanying drawing in which Figure 1 shows a Sparklet siphon in whichthe dip tube is provided with a baffle in accordance with thisinvention,

Figure 2 is an underside plan view of the lower end of the dip tube andbaffle of Figure 1 on an enlarged scale,

Figure 3 is an elevation, partly in section, of the dip tube and baflieof Figure 1 on an enlarged scale.

While in the drawing the baffle is shown provided on the dip tube of asiphon of the Sparklet type, it will readily be understood that it isapplicable to any type of siphon for aerated liquids in which carbondioxide under pressure is admitted through the dip tube.

Referring to Figures 1, 2 and 3, the siphon shown consists, as usual, ofa container I into which the liquid to be aerated is charged. Extendingto a point adjacent the bottom of the container I is a dip tube 2 whichis in communication through a non-return valve with a piercing pinWithin the screw-threaded portion 3 (covered by a loose cap 311 exceptduring the actual charging operation) onto which the holder containingthe gas capsule or Sparklet is screwed when charging the container Iwith carbon dioxide. The dip tube 2 also communicates through a valveactuated by a lever at the rear of the head with the outlet 4 throughwhich the aerated liquid is discharged when desired.

To the lower end of the dip tube 2 is secured a sleeve 5 which may be ofpure tin. This sleeve, in the example shown, is provided with threestepped projections 6 which are bent inwardly to hold in position abaffle plate I which may be of stainless steel. The distance between thebafiie plate 1 and the lower end of the dip tube 2 is dimensioned so asto allow free passage for the aerated liquid when it is desired todischarge the same from the siphon. If, during the charging of thecontainer with carbon dioxide, the capsule containing the compressed gasis pierced too rapidly, the cooling effect may be so strong that solidcarbon dioxide is formed. This is forced down the dip tube 2. Instead offalling onto the glass bottom of the siphon and subjecting the glass tolocal strains, as hitherto, the solid carbon dioxide is swept by the gasthrough the openings between the bafiie plate I and the lower end of thedip tube 2 into the surrounding liquid in a direction substantially atright angles to the dip tube 2. The solid carbon dioxide is thusaiiorded ample opportunity to evaporate before it can contact with theglass wall or bottom of the container I and liability of strainconsequent upon such contact is therefore avoided.

What I claim is:

A dip tube for a siphon for aerated liquid in which carbon dioxide underpressure is introduced into a liquid to be aerated through said dip tubeand aerated liquid is adapted to be discharged through said dip tube,said dip tube being provided at its lower end with a baflle comprising asleeve having notches forming spaced projections at the lower end ofsaid sleeve, a bafile plate supported by said projections and closingthe lower end of said dip tube, said notches providing radially directedopenings a1- lowing free passage of liquid upon operation of the siphon.

WILLIAM BREWER.

